Mint Never Hinged (MNH) = Stamp is new, post office fresh.

Mint hinged (MH) = There are many versions of MH, the following hopefully will help you.

1. (MVLH) = Stamp is very close to post office fresh, hard to see area where stamp was hinged.

2. (MLH) = Stamp is close to post office fresh, has very little gum disturbance. 

3. (MH) = Stamp will have disturbed gum.

4. (MNG) = Un-cancelled stamp with no gum.

5. (MHR) = Stamp will have hinge residue on back.

6. (MHH) = Mint stamp which has been heavily hinged with disturbed gum.

7. (MOG) = Stamp is Mint with old gum, color of gum varies or cracked.
8. (MSG) = Mint stamp with sporotic gum, could have as much as 50% of gum missing.

CONDITION OF STAMP

1. (XF) = Post office fresh, cream of the crop.

2. (VF) = Stamp has no tears, creases, missing perf's, hinge thins, soil or anything else that leads to the detriment of the item.

3. (G) = Usually as above VF, except it may have some soil and heavy cancellation.

4. (F) = Stamp could have a missing perf. or two, a small hinge thin or pin hole, heavy cancellation, and generally poor color quality.

5. (DAM) = Items with this designation may have a tear, large hinge thin, several missing perf's, or any other problem which is detrimental to the stamp.  Items with this designation are generally sold as "fillers" .

Note: I try very hard to grade all items to the above guidelines.  I've been known to miss one or two, but if I do, please do not hesitate to let me know and I will make it good.